Hegeter (Hegeter) merkli sp. nov. is described, illustrated, and compared with H. (H.) brevicornis Lindberg, 1953 and H. (H.) gomerensis Wollaston, 1864. The following diagnostic features are proposed for the newly established species: antennomeres not cylindrical, bristles of antenna conspicuous, antennomere 5 longer than wide, prosternal apophysis with a deep, narrow furrow, males with small prosternal tuft of bristles, and aedeagus distally straight and pointed. New faunistic records for the genus are provided. The lectotype for Hegeter gomerensis Wollaston, 1864 is designated in order to fix the nomenclatural status of the taxon. A key to the Hegeter species of La Gomera is provided.